The inspection lot won't care about me unhooking my battery before I give them the keys." sir, you don't need to worry about the sacked out check engine light' LOL. The weird part is is when I disconnect the battery, the code doesn't come back until I put it in 4 wheel drive. I can drive it all day long no codes in 2wd
An 0432 code has absolutely zero to do with transfer case position. After you disconnect the battery it takes some time for the O2 monitors to run and the timing has to be a coincidence for it coming back on.
Yeah it's an '02 4.0. It has the pre cats and that's where I'm confused. All of the sensors are up at those instead of the back cat. When the PO, who is a mechanic, said the guts were stripped I just assumed it was the back cat. But I learn something every day with my that beast.
There are 2 pre cats right off the exhaust manifold and one main cat right before the muffler. There are only 4 O2 sensors: 2 upstream of the precats and 2 directly downstream. So the computer doesn't pick up any info after those last 2 sensors. That means it won't know if the main cat is gutted or even there.
It's not difficult. I just did mine recently. You'll need a 15mm socket and a bunch of long extensions and maybe a wobble attachment to get to the bolts on the precat to exhaust manifold flange, and it's a good idea to hit them with penetrating oil beforehand. The Y-pipe is one piece that includes the precats and tubing that wraps around the oil pan towards the rear. I bought mine from Flowmaster. It fit very well and included the main cat too.
I usually just put my A/C in recirculate when there is a stinky car in front of me.I may be in the minority, but as someone regularly running with an open Jeep in a state with no emmissions inspections I would say that people need to keep that exhaust cleaner than they do. I don't want to breath that stuff in while driving behind someone on a 2 lane road for 5 miles. My TJ certainly ain't built for passing them
